"Reports have suggested that triclosan can combine with chlorine in tap water to form chloroform gas, which the United States Environmental Protection Agency classifies as a probable human carcinogen. As a result, triclosan was the target of a UK cancer alert, even though the study showed that the amount of chloroform generated was less than amounts often present in chlorinated drinking waters.

Triclosan reacts with the free chlorine in tap water to also produce lesser amounts of other compounds, like 2,4-dichlorophenol. Most of these intermediates convert into dioxins upon exposure to UV radiation (from the sun or other sources). Although small amounts of dioxins are produced, there is a great deal of concern over this effect because some dioxins are extremely toxic and are very potent endocrine disruptors. They are also chemically very stable, so that they are eliminated from the body very slowly (they can bioaccumulate to dangerous levels), and they persist in the environment for a very long time. However, dioxin is not one compound, but a family of compounds of widely ranging toxicity. The dioxin compound that formed when triclosan degraded in sunlight is not a dioxin of public health concern.

Triclosan is chemically somewhat similar to the dioxin class of compounds. Its production leads to small amounts of residual polychlorinated dioxins, and polychlorinated furans which are contained in small amounts, in the products that are using it.

A 2006 study concluded that low doses of triclosan act as an endocrine disruptor in the North American bullfrog. The hypothesis proposed is that triclosan blocks the metabolism of thyroid hormone, because it chemically mimics thyroid hormone, and binds to the hormone receptor sites, blocking them, so that normal hormones cannot be utilized. Triclosan has also been found in both the bile of fish living downstream from waste water processing plants and in human breast milk.The negative effects of Triclosan on the environment and its questionable benefits in toothpastes has led to the Swedish Naturskyddsföreningen to recommend not using triclosan in toothpaste.

Triclosan is used in many common household products including Clearasil Daily Face Wash, Dentyl mouthwash, Dawn, the Colgate Total range, Crest Cavity Protection, Softsoap, Dial, Right Guard deodorant, Sensodyne Total Care, Old Spice and Mentadent."

I stole those paragraphs above from wikipedia, no point in me summarizing it, but I can in two words, TRICLOSAN SUX! I was using Sensodyne to get rid of my teeth sensitivity that i've had for as long can remember. Not only did it not work, but it had triclosan! My aunt Mairone gave me hand creams by Avon Naturais because supposedly it's not tested on animals, and it also had triclosan listed on the ingredients list that wasnt even in portuguese. It was in english! That would be like something in portuguese being sold here, not everyone understands portuguese.

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